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Measuring horsepower can also be done by accurately measure the acceleration of the vehicule with acceleration sensors.
With the weight Cr and the Cd.A value into the program a horsepower curve can be established.
A friend of mine made such a device which installed in the car can measure the acceleration every some many milliseconds.
Measurement should take place on a flat road .
I used to accelerate in first gear from zero to max rpm.
Probably those measurement boxes sell also in the States.
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